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iSS

PRACTICAL ORGANIC CHEMISTRY

(eosin). After standing two hours the precipitate is filtered,
washed with spirit, and dried at 110° to expel alcohol of crystalli-
sation. Yield 30 grams. .

In order to obtain the sodium compound, 6 grams of the
product are ground in a mortar with i gram of sodium carbonate,
placed in a beaker, and moistened with alcohol. Five c.c. of
water are added and the mixture boiled until the evolution of
carbon dioxide ceases. To the sodium salt 25 c.c. spirit are
added and the mixture boiled and filtered. On standing for
a day or two, the sodium salt crystallises in brown needles.

/OH

co

2C6H4(OH)2 —> C6H4/

I
O

\CO

OH



QHBr

/

OH

C6H



asOII + SBr-->QH,

/|\CflHBr!

I

X

OII

See Appendix^ p. 296.

PREPARATION 8-3.
Salicylaldehyde (0-Hydroxybenzaldehyde)
p-Hydroxybenzaldehyde,
Reimer, Tiemann, Ber.> 1876, 9, 824.          /
r H /OH       ii
^e^^co.H    2    4-
50 grms. phenol.
100    „     caustic soda.
160     „      water.
75     „      chloroform.
The phenol, caustic soda and water are mixed together in Łt
round flask (i litre) attached to an upright condenser aricl
heated to 50—60°. The chloroform is then added gradually